Means for preventing offset in perfecting printing-machines



(No Model.)

J. T. HAWKINS. MEANS POR PREVBNTING oFF-SET 1N PERPBCTING-PBINTING MACHINES.

UNTTnn STATES PATENT OFFICE.

JOHN T. IIAVKINS, OF TAUNTON, MASSACHUSETTS.

MEANS FOR PREVENTING OFFSET lN PERFECTING PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 419,017, dated January 7, 1890.

Application iiled March 28, 1889. Serial No. 305,193- (No model.)

T all whom it may concern:

Be it known that I, JOHN T. IIAwKINs, of Taunton, in the county of Bristol and State of Massachusetts, have invented new and useful Means for Preventing Offset in Perfecting Printing- Machines Printing from Flat Forms, which invention is fully set forth and illustrated in the following specification and accompanying drawing.

The object of this invention is to provide a perfecting printing-machine printing from two flat forms, with, or to adapt the same to receive, an apparatus for preventing oifset of the ink from the freshly first-printed sides of the sheets upon the second impression-cylinder by the means shown in my pending application, Serial No. 305,189, herewith filed.

The invention will first be described in detail, and then particularly set forth in the claims.

The accompanying drawing shows in vertical section so much of a tlat-bed'perfecting printing-machine as is necessary to fully illustrate this invention.

In said drawing the several parts are indicated by reference-numbers, as follows:

l indicates one of the main frames of the machine; 2, the type-bed carrying two forms 3 and 4, 3 printing the iirst and a the second side of the sheet.

5 indicate ink-rollers and 6 the distributingrollers for form 4, and 7 the ink-rollers and 8 the distributing-rollers for form 3. By suitable nieehanism in any of the well-known ways the rollers 7 and S are raised at the proper time to clear the form 4, as shown, and, similarly, rollers 5 and G are raised to clear form 3.

9 indicates the feed-board, 10 the first impression-cylinder, and 11 the second impression-cylinder, each cylinder geared in any of the well-known ways to the bed-reciprocating' mechanism, so as to make two revolutions for each impression, and also by any of the wellknown methods arranged to rise and lower alternately to escape the forms on the nonprinting revolution and to be held in contact therewith on the printing revolution.

13 and 1a indicate the grippers, respectively, of cylinders and 11.

The transfer-cylinder 1G, carrying grippers 19, takes the sheets from the grippers of impression-cylinder 10 and transfers them to the similar transfer-cylinder 20.

The transfer-cylinder 20, carrying grippers 21, is half the diameter of the impressioncylinders 10 and 1l and makes four revolutions to each sheet printed, receiving the sheets from the transfer-cylinder 1 G and transferring them to the impression-cylinder 1l, carrying each sheet four times around it after receiving the sheet from the transfer-cylinder 16 and before transferring it to the impression-cylinder 11.

The transfer or delivery cylinder carrying grippers 23, receives the sheets from the impression-cylinder 11. A well-known oscillating iiy 24 receives the sheets from the transfer or delivery cylinder 22 and delivers them upon a receiving-table. (Not shown.)

The impression-cyliuders 10 and 1l, the transfer-cylinder 1b', and transfer-cylinders and 22 are all geared together by proper spur-gears on their respective axes, meshing together at the lines of contact of the several cylinders, these gears being omitted as being unnecessary to illustrate this invention, and as well understood in the art in such constructions. Each of the two impression-cylinders 10 and 11 makes two, and the tranfercylinders 1G, 20, and 22 each makes four revolutions to each sheet printed.

A continuous web 40, of absorbent material, preferably paper, runs in c ontact with the transfer-cylinder 2O and the second impression-cylinder 11. A series of elastic-surfaced rollers or cylinders 25 26 27 2S is arranged to run on and press the web into close contact with the freshly iirst-printed side of each sheet. Similar rollers 3 are arranged to press a similar absorbent web i2 into contact with the tympan-surface of the second impression-cylinder. An absorbent web 41, similar to web 40, runs in contact with the first impression-cylinder l() or the sheets upon it. The webs 40, al, and l2 are led off to any convenient place, so as to be 'fed each from one and be received upon another roll in any of the well-known ways, or they may be led over leading-rollers as endless webs.

Flat-form perfecting-presses may be rcquired to perfect a common order of printing-sucl1 as almanac-printing, advertisingpamphlets, &c.-in which case the applica- IOC) tion of the web 4l to the first-printed sides of the sheets as they pass on the first impression-cylinder, after being printed on t-heir first sides, will be sucient. For a higher class of work-such as illustrated newspapers-the web 40, running over the sheets on transfer-cylinder 20, alone may be added, and for the highest grades of illustrated book- Work the web 42 may also be used to pass in contact with the tympan-surface of the second impression-cylinder.

The operationof the machine is as follows: The sheet is fed to the grippers 13 of the impression-cylinder from the feed-board 9 in t-he usual way, is thencedcarried around cylinder lO, printed on its rst side, run under and in contact with the absorbent web 41, thence transferred to cylinder 16, thence to cylinder 20,is then carried four times around cylinder 20, each time in contact with the absorbent web 40, is then transferred to impression-cylinder ll and printed on its secp ond side. Thence it is transferred to cylinder E32 and thence upon the fly 24, or to any other suitable delivery apparatus, the web 4l hav-- ing first run in contact with the printed sides of the sheets on the firstimpression-cylinder. Then the web 40 is in contact four times with the printed sides of the sheets on the transfer-cylinder 20, and, lastly, the web 42 'runs in contact with the tympan-surface of the second impression-cylinder when arrranged touse all three absorbent Webs.

The mechanism for operating the several sets of grippers has been omitted, as these constructions, being well known in the art, are unnecessary to illustrate this invention.

Having thus fully described my said improvements as of my invention, I claiml, In a perfecting printing-machine printing from rflat forms, in combination with a transfer-cylinder, as 20, an absorbent web and one or more rollers or cylinders running thereon, placed in the machine so that said absorbent web will be pressed into contact with the first-printed sides of the sheets by said rollers or cylinders while remaining upon the said transfer-cylinder, whereby offset of ink upon the tympan-surface of the second impression-cylinder is reduced or prevented,

. substantially as set forth.

ent web and one or more rollers or cylinders running thereon, placed in the machine so that said absorbent web will be pressed into contact with the sheets upon said transfercylinder, whereby offset of ink from the firstprinted sides of the sheets is received upon said absorbent webs and offset of ink upon the tympan-surface of the second impressioncylinder reduced or prevented, substantially as set forth.

3. In a perfecting` printing-machine printing from fiat forms, in combination with asecond imp ressi on-cylinder, an absorbent Web and one or more rollers or cylinders running thereonVplaoed in the machine so that said absorbent web will run upon and be pressed into contact by said rollers or cylinders with that part of the tympan-surface of said second impression-cylinder upon which the sheets to be printed do not pass, whereby any deposit of ink-offset thereon from the first-printed sides of the sheets is removed before said tympansurface again comes into contact with the sheets to be printed and reoffset of ink from said tympan-surface upon t-he sheets prevented, substantially as set forth.

4. In a perfecting` printing-machine printing from flat forms, in combination with the first impression-cylinder, a transfer-cylinder, a second impression-cylinder, an absorbent web and one or more rollers or cylinders running thereon, placed in the machine so that said absorbent web. will run upon and be pressed into contact with the sheets upon said first impression-cylinder after being printed on their first sides, and an absorbent web and two or more rollers or cylinders running thereon, placed in the machine so that said absorbent web will run upon and be pressed into contact with the sheets passing upon said transfer-cylinder, and an absorbent web and one or more rollers placed in the machine so as to run upon and be pressed into contact with that part of the tympan-'surface of said second impression-cylinder upon which the sheets to be printed do not pass,whereby superiiuous ink is offset from the first-printed sides of the sheets upon said two first absorbent webs, any residue of ink. deposited upon the tympan-surface of said second impressioncylinder removed by the third absorbent web from the tympan-surface of the second impression-cylinder before said tympan-surface again comes into contact with the sheets to be printed and reoft'set of ink from said tyinpan-surface upon thesheets prevented, substantially as set forth.

- lJOHN T. HAVVKINS. lVitnesses:

J. F. HALEY, ALBERT J. PARK.

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